Telephone.



No. 855,394. PATENTEDIM'AY 28, 1907.

O.F.FALK.

TELEPHONE.

APIPLIOATION FILED JULY 1, 1905.

Fig. 1.

WITNESSES: JNENTOR.

' ATTORNEY.

FTQE.

osciin F. TALK, or BosT'oN, MASSACHUSETTS, AssreNon To AMERICAN TELEPHONE AN D YORK.

' Specification of Letters Patent.

TELEGRAPH COMPANY, A, CORPORATION OF"NE.W

TELEPHONE...

Patented May '28, 1907.

Application filed July 1,1905. SBriaINO- 267.962, I

To all whom, itJYI/wy concern.-

Be it known thatI, OsoAR F. FALK, resid-' ing at Boston, in the-county ofSufiolk and State. of Massachusetts, have invented certain Improvements in. Telephones, of-which the following is a specification.

The invention relates to that class oftelephones known as hand-set or combination telephones, in which a transmitter and a reoeiver are secured to the two ends of a han-v positions which cause the granular powder of the button to fall entirely away from one or the other of the carbon electrodes. As the hand-set is often held or moved into such po' sitions during conversations, it is evident that at such times the. transmitter will not 2 5 operate. I

The object of the invention is to obviate this difiiculty, and the invention consists in so attaching the transmitter to the end of the handle-bar, opposite the end to which the re- 0 ceiver is attached, that the mouth-piece and diaphragm of the transmitter when the handset is in use shall be in substantially vertical and parallel planes while the planes of the ear-piece and diaphragm of the receiver are also substantially vertical and parallel, and

at right angles to the planes of the mouth-- piece and diaphragm of the transmitter, the

said transmitter being of the granular carbon button type and having itsfsaid button at an 0 angle with itstdiaphragm, thereby maintaining the granular powder in contact with both carbon electrodes in all positions which. the

transmitter may take while in use.

In the drawings hereto annexed and forming apart of this specification, Figure 1 is an elevation of the handle-bar with receiver and transmitter attached. Fig. 2 is a cross-section of the transmitter showing in detail so much of the interior thereof as is necessar to 5 exhibit the invention.

tion. I

H is the hollow handle-bar containing in Fig. 3 is a modi ca;

the usual manner wires and connections which is not necessary to show.

' R is areceiver of the watch-case pattern, secured-to one end of thehandle-bar by a pivot 6; which allows to the receiver a slight movement to accommodate it to the ear of the user. The receiver consists of the custom-- ary case or shell t and cover or ear-pieceQc, secured thereto by a clamping-ring nut 6, containing the diaphragm, magnet, induction coils, receiver circuit terminals, etc.,' all; within said case, but not shown. Tis the transmitter also substantially of the watchcase pattern, rigidly secured to the other end of the said handle-bar,'which bar is so bent or formed that when it is held in the hand of the user and the receiver is placed at his ear, the mouth-piece of the transmitter will be directly in front of the mouth of the user and the diaphragms of the transmitter and receiver will both be substantially vertical and substantially at right angles toeach other.

'A is the outer case or shell of said transmitter secured to the hollow handle-bar H by screws s, s, as shown. .B is a cover for said case having nearits outer edge a circular flange, B, fitting within'the case and secured thereto by screws, 8, s. v

O is the mouth-piece of the transmitter screwed into the cover and furnished with a perforated protector, as shown:

D is the transmitter diaphragm secured to an inner case or metallic shell E by a dam- 5 pening fastener such as an elastic rubber dampening band F, the said diaphragmiand inner case being separated by a paperfring G,- while J is a ring of'mica, separating the as sembled diaphragm, inner case and rubber '9 bandfrom the cover B." This combination .of inner case, diaphragm, rubber band, etc.

together with the granular button,-next to'be described, within the inner case, is held in position by a spring 3 secured to a block or prO- jection on t e inside of the flange B of the cover by a screw, as shown, and forms a unitary device or portable article comprisin all of the essential parts of the transmitter eld compactly together, which device as a whole is readily attachable to or detachable from any standard instrument. This transmitter is claimed in a divisional application filed July 2d, 1906, Sr. No. 324,525. The bearing end of the spring has a rubber hood, as

shown, and presses against the rubber band V is a variable F outside of the inner case. resistance granular carbon button, consisting of a shell in two parts, containing the customary front and back electrodes and granulated carbon, which in the state of the art it is uncluctive connection to the back electrode, is

in conductive connection at screw 8 with one wire of the transmitting circuit, while the front electrode is in conductive'connection with the other wire of the transmitting circuit at screw 8 by means of a wire W conductively connected with the front electrode and assing through an insulated bushing in the fgont part ofshell V and in said inner case.-

Lfis a rigid shank projecting from the front electrode of the button V. Its outer end in one form of the hand-set, Fig. 2, projects through a slightly-up-set ulortion of the diaphragm at the center of t e'diaphra m and is secured by a thumb-screw M. n the modification shown at Fig. 3, the shank L is bent so that its end passes re'adily'through the center of the diaphragm and is secured by a thumb-screw M in the ordinary manher. The straight-tubed n10uthpiece used in either construction allows sounds to fall mitter diaphragm, whereby contact between I the granu ated'conducting material of the carbon button-and its cooperating electrodes will bevrnaintained inall positions which the hand-set may take while in use; y

2. In a hand-set or combination telephone, a handle-bar having a receiver at one end and a transmitter at its other end, the diaphragm of the receiver "and transmitter being in planes approximately at right angles to each other, and the transmitter including a granular carbon button connected and disposed at an angle to the transmitter diaphragm whereby contact between the granulated conducting material of the carbon button and its cocperating electrodes will be maintained in all positions'which the hand-set may take While in use.

In testimony whereof, I have signed my name to this'specification in the presence of two subsci'ibing witnesses, this 29th day of June 1905.

v OSCAR F. FALK.

Witnesses; r

Geo. WILLIS PIERCE, JOSEPH A. GATELY. 

